Fiery orange triangle with blinking lights on rear, moved from east to west and pitched from side to side.I am located in Brockton, Massachusetts, near the border with Holbrook and Abington. I was outdoors facing the northeast, watching the sky for meteors. First saw a normal airplane come over the horizon and travel across the sky. Next, I noticed an iridescent orange glow that I could not initially resolve. Went to get my prescription glasses out of my car and it had moved further along. It was triangle shaped, and the color and light it seemed to be emitting was like fire. As it passed directly overhead and moved off toward the western sky, I noticed blinking lights on the rear of the object. Starting in the east, it did not move in a fixed path like an airplane would, but instead was moving off side to side slightly irregularly while heading east/west. It then banked northwest slightly after passing overhead and appeared to be pitching side to side, making the triangle shape more obvious against the dark sky. It was still fiery orange but almost appeared to ! be reflecting light while pitching rather than emitting. The whole sighting lasted approximately five minutes total. The object did not emit any sound, and was moving at approximately the same speed as an aircraft in the distance that had been spotted a moment earlier. Horizon to horizon over a few minutes. It did not appear to be a meteor or bolide, and did not break up or leave a trail behind.